devblogs.microsoft.com / .devblogs-microsoft-com-nuget

I am building a complete C# agent live, from a single call around an IChatClient to a production-ready, observable, governed agent, using the Microsoft Agent Framework harness in a 4-part Microsoft Reactor series.

Take a tour through hundreds of performance improvements in .NET 11.

Share how your team uses .NET to solve real problems and help us bring more community stories to .NET Conf 2026 and other .NET channels.

Learn how C# unions and closed hierarchies work with System.Text.Json across ASP.NET Core Minimal APIs, MVC, SignalR, Blazor, and OpenAPI.

.NET 11 Release Candidate 1 is available with improvements across libraries, runtime, SDK, MSBuild, NuGet, C#, F#, ASP.NET Core, .NET MAUI, and Windows Forms.

Submit your session proposal for the community-led .NET Conf 2026 Community Days by October 6, 2026.

A recap of the latest servicing updates for .NET and .NET Framework for September 2026.

MSTest source generation lets test projects use the same Native AOT and trimming deployment model as the applications they validate, while reducing reflection on the test execution path.

How Uno Platform built two Model Context Protocol servers in C# so AI agents can ground themselves in real documentation and then see and drive a running cross-platform .NET app.

.NET Conf returns November 10-12, 2026, with three days of sessions, community, and the launch of .NET 11.